To cite the projectR package in publications use:

  Gaurav Sharma, Carlo Colantuoni, Loyal A Goff, Elana J Fertig, and
  Genevieve Stein-O’Brien (2020). projectR: an R/Bioconductor package
  for transfer learning via PCA, NMF, correlation and clustering.
  Bioinformatics 36(11), 3592-3593.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {projectR: an R/Bioconductor package for transfer learning via PCA, NMF, correlation and clustering},
    author = {Gaurav Sharma and Carlo Conlantuoni and Loyal A Goff and Elana J Fertig and Genevieve Stein-O'Brien},
    journal = {Bioinformatics},
    year = {2020},
    volume = {36},
    issue = {11},
    pages = {3592–3593},
    url = {https://academic.oup.com/bioinformatics/article/36/11/3592/5804979},
  }